Text Editor UndoRedo

Design and implement a simple text editor that supports a basic set of operations along with undo and redo functionality.

The editor should support the following operations:

1. Insert: Insert a given string at a specified position in the current text.
2. Delete: Delete a substring from the text starting at a given position with a specified length.
3. Undo: Revert the most recent insert or delete operation (multiple undos should be supported).
4. Redo: Reapply the most recently undone operation if any.

The editor is expected to process a series of these operations and maintain the correct state of the text after each operation.

Your task:

• Define an appropriate API (classes, functions, etc.) to model the text editor and its operations.
• Ensure that the undo and redo operations work correctly even after a sequence of mixed operations.
• Optimize your data structures so that each operation is performed efficiently.

Consider edge cases such as:

• Inserting or deleting at invalid positions
• Attempting to undo when there are no operations to undo
• Attempting to redo when there are no operations to redo

You can assume that the operations will be provided in a sequence (for example, from standard input or as function calls) and that all operations are valid if performed in order. The implementation language is up to you.

Please provide your solution along with a brief explanation of your design choices.